Question

Expand the following using suitable identity (3x+2y)^3

Answer 1

Answer:

by using identity = (a+b)³

(a+b)³= a³+b³+3ab(a+b)

=(3x)³+(2y)³+3×3x×2y(3x+2y)

=27x³+8y³+18xy(3x+2y)

=27x³+8y³+54x²y+36xy²